<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            background-color: bisque;
        }
        .box {
            width:  300px;
            height: 300px;
            font-size: 30px;
            border:1px solid;
            /* background: rgb(245,245,4); */
/* background: linear-gradient(135deg, rgba(245,245,4,1) 0%, rgba(196,30,92,1) 29%, rgba(249,55,109,1) 52%, rgba(227,49,158,1) 76%, rgba(255,0,7,1) 100%); */
            background-image: radial-gradient(circle, rgba(245,245,4,1) 0%, rgba(196,30,92,1) 29%, rgba(55,249,152,1) 52%, rgba(49,105,227,1) 76%, rgba(255,0,73,1) 100%);
            border-radius: 50%;
        }   
    </style>
</head>
<body>

    <div class="box"></div>
    
</body>
</html>